Trip device.



UNITED srn'ri is arnnr OFFICE. GEOBGE WALDEMAR BUNGAY, OF lBBOOKLYN, NEW YORK, ASSIGNOR 'I'O ACME DIE CAST 1N6 CORPORATIONQ A CORPORATION OF NEW YORK.

'rnir DEVICE.

indication Lette s remit. Application filed Auglust 80, 1916. Serial No. 117,597.

improvement to produce a relatively sudden and, so to speak, explosive propulsion of the metal into the mold, whereby as I have discovered there is attained a greatly impro'ved perfection in sharpness of detail in moldin To all whom it may concern:

Be it known that I, Gnomew wams BU'NGAY, a citizen of, the United States, residing at the borough of Brookl n, in t e county of Kings and State of blew Yor have invented certain new and useful Improvements in Trip Devices, of which the ollowing is a specification, reference being had therein to the accompanying drawings, forming part thereof.

My present invention relates proved apparatus or means for a plying the expansive power of an elastic uid to the propulsion of a working element and especially to means for supplying molten metal to a suitable mold in die casting work and the like.

My invention is particularly suited to emcausing the pressure to accumulate behi nd the drivin filpiston of the pump while restraining t, e pump from forward movement, and finally suddenly removing the restraint. The pump moves forward under the sudden im act of the full pressure accumulated, an the filling of the mold is so suddenly accomplished that pressure can be exerted over the entire interior substantially instantaneously and before the metal which touches the cold walls-has time to congeal.

to .an imbodiment in the general type of apparatus e me r arry ng ut his method disclosed and claimed in my co-pending ap-- of operation lends itself to use in connection licatioh for patent Serial Number 54,123, with apparatus wherein a high pressure of led October 5 1915, which became Patent elastic fluid may be accumu ated in osi- No. 1,279,249, eptember 17 1918, f r ea ttively active r .lation to a movable wor 'ng Patented Nov. 19, 1918. p

I find that this can be accomplished by i ing apparatus, and wherein the molten meta element. I employ such means for the 'op'er- 75 is forced into the mold by the ressure 0 when of a flui controlled pump, and in so steam or other elastic fluid. I ave thered mg I restrain the pump temporarily to fore described and illustrated my improvepermit a body of steam or. the like to acment as embodied in the type of apparatus cumulate behind the piston in free relab b u d r t d tion thereto. whereby I mean, unhampered above mentioned, but it is that my invention is not limited to the particular type of apparatus herein shown.

Where the molten metal is forced into the mold by means of a pump actuate by the expansive power of steam or the like as hitherto employed, the movement of the metal is relatively slow and the continuous ressurc relatively low, owing to the time taken for the steam to enter the space above the driving piston, and the resistance 0 ere j steam into said space, wherethe boiler cannot m .In other words, this full pressure is constantly being by the f movement of the As a result, the molten metal as it the cold mold has a tendency to congeal against the walls thereof before the by the interference resulting from the resistance o ered by entrance passages and conduits. In this manner am one to make the driving piston start forward under the full pressure of the boiler. The larger the' space behind the driving piston, wherein accumulation of steam may take place, tion be made available.

A referred embodiment of my invention is illustrated in the accompanying drawing wherein Figure 1 is a si e elevation Of the pending application aforesaid; Fig. 2 is a horizontal section on the line 2-2 in Fig. 1; and Fig. 3 is an end elevation of the ma chine shown in Fig. 1.

The details of the construction and operation of the machine as a whole are fully mold is filled and pressureapplied, and thus erfection of detail is her to realize. in (16 61! ed in my aforesaid pending applicamany cases. tion, d I shall therefore give ere only a general description of a nature suflicient It is the principal object of my present e of die casting machine described in my the more effectively can my inveninc 6' 10, and within this 10 other suita le means. T 'e tightly into a suitable to the inventlon.

I in providm an gnu be made-to slide t ia d ustment.

said pending application.

ported on the extremity of the rods 60 which slides the support 34 carrying lhe,sec-

65 in the brackets 31.

i as a" foundation for the description of the improvement forming the subject, matter of my present claims.

In the drawin box is placed the melting pct 11, containing the main body of molten metal. The pum for forcing this metal into the mold is shown in Fig. 2 at 12, the same bein supported b a cross bar 13 or I pump discharges into a ipe or duct 14 whic curves upward from t e bottom of the pump to a point slightly above the level of the molten metal, where a nozzle 15 is formed so as to fit opening in the mold on this latter is closed and is forced. down upon said nozzle.

The piston or plunger 16 of the'pum is operated by a iston within the steam cy in- 30 der'17, with w ich itis connected by the rod 18, referably made to fit'within a socket 19 on t e lower end of an u er rod section 20. This arran ement is mere y to facilitate the assembling f the parts, andis not essential It is convenient, however, the restraining shoulder as hereinafter scribed.

The steam cylinder 17 is sup orted above the pump 12 by the u right 'llars 21, and

1 ereon or purposes of This is accomplished by the crank 22 turning the shaft 23 which operates throu h a rack orpinion to depress and elevate e, cylinder 17 .asfully, described in By admitting steam or the like from the pipe 24 to one side or the other of the piston within the cylinder 17, in any well known manner, the

plunger 16 of the metal pump may be Je-" go pressed or raised at will; In the particular as more fully described in my said pending application, suitable rotary valves, located within the valve box 25 are operated by means of a shaft 26. This construction shown,

isaccomplished by means of an arm 27 on said shaft connected b a pivoted link 28 to an arm 29 on the rocli shaft 30. This last named shaft is operated from the main controlling handle hereinafter desc'ribed, all as fully explained in my said pending applicw,

The mold operating mechanism and main controlling means are sigiported upon Stout brackets 31 fixed to the re box 10 and may be described generally as follows, omitting some details not'relevant to the present improvement.

One side 32 of the separable mold 'is sup- 33. upon ond part of the mold shown weight of the sup ort 34 is partly carried by side pillars 36, aving rollers 37 on their extremities, adapted to travel within slots 38 The sliding movement of at 35. The

the fire box isshown at the support 84 on the rods 38 essential to opening and closi the moldis produced by connecting rods 8 and 40 one end of sec of which is pivotally connected with the support 34 while their opplosite ends; are sumarly connected with be crank levers 41 and 42, which are madet'o move in unison by the link 43 connected, as shown, to both.

The arts so far mentioned; are all supported Iv and project; from oneside of a steamc inder 44, having stifiening webs 45 attache, to truninons 46 .turning in bearings 47 adapted to slide along the supporting rods 48, for purposes of adjustment. The cylinder contains api'ston, not shown, by movement up and down of which the bell crank levers 41 and 42 are made to rock to .open or close the meld while moving. it

by reasonof the inclined slot 38. This action together with the rack and/pinion construction through which the piston in the cylinder 44 operates are set forth in detail in my said. pending ap lica'tion. 4

team or the like is made to enter or leave one or the other end of the cylinder 44 by me'ans of valves within the valve boxes 49,

5,0, vhich valves are operated by the rock shaft 51. The steam is supplied by the pip- 53 is so connected ing 52. A rocking arm as to .rockthe valve shaft 51 at will, being preferably moved by a handle 54 forming part of a special, fully set forth in form of main controller said pending application. he same controller handle acts through the rock arm 55 to operate connections not here shown, whereby the shaft 30 is made to control the valve shaft 26. This, also, is fully shown in said pending application. I

The mode of operation explained in my earlier ap lication involved first, closing the mold land ringing it down into firm contact I with the nozzle 15, by means of turning the steam into one end-of the eyl 0nd, forcing the molten metal by actuating the of steam admitted inder 44; secump plunger-16, by means over the piston in the cylinder 17; third, when the. moldj hadbeen" filled), lifting the plunger 16 by Iexhaustin steam from the upper end ofthe cylinder 1% while admitting thereof; and lastly reversin Y the action of e steam within-'the cylin er 44, so as to open the mold, to remove the article molded.

The present improvement. involves changing this mode of operation to the extent of preventing movement of the plunger 16 during an interval of'time suflici accumulation of ressure in the upper end of the cylinder 1 plunger, permitting it to shoot forward with a much moreigsudden movement than'would otherwise given it. This causes the molten-metal to be thrown, so to gpeak, e3

into the mold steam to .the lower end' ent toallow an i and ,then releasing the plosivnly into the mold so that it will become full and be subject to pressure before the cold walls thereof have had time to interfere with perfect action by any cooling of the metal.

In order to accomplish this end a varicl of expedient-s may be resorted to and I have illustrated one of these in m v drawings merely as an example of a variety of corn struotion which would come within the scope of in i invention.

Upon the rod or rods which connect the plunger 16 with the sleam piston above il, i provide a. restrainingshoulder which may ronvenicntly be the under surface of the socket 19. A bolt or bar 55 slides Within a guide piece 56, so that one extremity thereof may he slipped under the shoulder above mentioned, as shown in Fig. 2, The guide piece 56 is shown as mounted upon a plate 56 which is preferably supported from the lower head of the steam cylinder 17 and is shown as connected thereto by means of bolts or :rods 56. The outer extremity of the bolt 5'! is connected to a link 55 which in turn is connected by a pin to a lever 57, whose other end bears a handle This lever is pivoted at 59 to a bracket (30 which is preferably mounted on the side of the fire box 10 in a manner to permit vertical adjustment, being finally secured by the bolts 61.

In operating the machine as thus corn structed, the operator would stand in front of the some as it is shown in Fig. 1, between the two handles 54 and 58. A 'r'tcr closing the mold down upon the nozzle 15 and admitting steam to the top of the cylinder 17, both bv means of the handle 54, he would pause suflicicntly to allow the desired aocumnlalion of pressure and would then push the handle 58 inward toward (be fire box. This would withdraw the bolt rind allow the plunger to propel the metal suddenly into the mold, above described. The handle 58 would ihen he again used; first in lift the plunger 16 and then to open the mold. As soon as the plunger 16 is lifted, or at any time before renewed admission of steam into the lop of the cylinder 17, the operator should draw forvurd the handle 58, and slip the bolt 55 under the rcslrain .ing shoulder.

It is obvious thab various modifications may be made in the construction shown in the drawings and above particularly dcscrihcd within the principle and scope of my invention.

I claim:

1. Means for applying the expansive power oi. an elastic fluid to a pump for molten metal in a casting upg'iarutus. such means comprising a. pump element to be moved by such elastic fluid, means for acciunulating such fluid in potentially active relation to said pump element, and means i for restraining said pump element against movement during such; accumulation and for suddenly releasing said pump element for movement While said pump element is subjected to such accumulated pressure of the elastic lluid.

3. Casting apparatus having, in combination, a positively acting pump for molten metal, pumphctuating means adapted to be operated by the pressure of an elastic fluid and connecbed to the movable member of ihe pump, and numually controlled means for preventing the movement of and then suddenly releasing the movable member of the pump.

(lasting apparatus having. in combination, a. pump for molten metal com rising a relatively movable cglinder and p unger, operating means for t e pump comprising a relatively movable cylinder and piston, the movable part of said operating means being connected to the movable part of the pump, means for supplying elastic fluid to the cylinder of the pump-operating means, and a manually controlled catch device for locking said movable parts against movement and suddenly releasing them to permit their quick movement by the elastic fluid under accumulated pressure in the cylinder of said pump-operating means.

4. Casting apparatus comprising a mold, a positively acting pump for forcing molten metal into the mold, means for accumulating a body of elastic fluid under high pressure in free relation with respect to the movable member of the pump and means for restraining and finally suddenly releasing said member to produce, a relatively quick propulsion of molten metal into the mold.

5. In apparatus of the class described, a mold. a posiiivelf acting pump connected therewith by a suitable conduit, means for actuating the movable member of said pump, means for accumulating a suitable driving pressure in operativerelation with said actuating means, a restraining device for said pump, and means for rendering said restraining device nonoperati e at will.

6. in apparatus of the class described, a

mold, a positively acting pump connected therewith by a suitable conduit, means adapted to be driven by elastic fluid pressure for actuating the movable member of said pump, a restraining device for the pump, and means for rendering said restraining device nonoperative at will.

7. In apparatus of the class described, a pump adapted to be operated by fluid pressure comprising a movable plunger, a bolt for restraining said plunger, and means for operating said bolt to confine or release the piuw'er at will.

8. n1 apparatus of the class described, a

plunger, 9, cylinder and piston adapted for ing two connectin rods united by a socket operation by fluid pressure, a connection bepresenting a. shoal er, and a bolt adapted to tweensaid plunger and said piston, in re he slipped under said socket. strainin shoulder carried by said connec- In testimony whereof I have aifixed my 5 tion, (in a. boltads; tedito be slipped under signature.

said shoulder at wifi.

9. In apparatus of the class described, a phmger, a cylinder and piston adapted for Witnesses: operation by fluid pressure, a connection be GHARLES Gr. GQLDMAN, 1'0 tween seid plunger and said pisten compris- 'Enwm N. Won.

GEORGE WALDEMAR BUNGAY 

